Slider.cs

Siirry tämän tiedoston dokumentaatioon.

#region MIT License
/*
 * Copyright (c) 2009 University of Jyväskylä, Department of Mathematical
 * Information Technology.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#endregion


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Jypeli.WP7;

namespace Jypeli.Widgets
{
    public class Slider : BindableWidget
    {
        private bool pressedDown = false;
        private Touch touchObject = null;

        private Color _activeColor = Color.Red;
        private Color _inactiveColor = Color.DarkGray;

        public Widget Knob { get; private set; }

        public Color ActiveColor
        {
            get { return _activeColor; }
            set { _activeColor = value; }
        }

        public Color InactiveColor
        {
            get { return _inactiveColor; }
            set { _inactiveColor = value; }
        }

        public Widget Track { get; private set; }

        public Slider( double width, double height )
            : base( width, height )
        {
            Color = Color.Transparent;

            Track = new Widget( width, height / 3 );
            Add( Track );

            Knob = new Widget( height, height, Shape.Circle );
            Knob.Color = Color.DarkGray;
            Add( Knob );

            Game.AssertInitialized( InitializeControls );
        }

        public Slider(double width, double height, Meter meter)
            : this(width, height)
        {
            BindTo(meter);
        }

        private void InitializeControls()
        {
            Game.Controls.Mouse.ListenOn( this, MouseButton.Left, ButtonState.Pressed, MousePress, null ).InContext( this );
            Game.Controls.Mouse.Listen( MouseButton.Left, ButtonState.Released, MouseRelease, null ).InContext( this );
            Game.Controls.Mouse.ListenMovement( 1.0, MouseMove, null ).InContext( this );

            Game.Controls.TouchPanel.ListenOn( this, ButtonState.Pressed, TouchPress, null ).InContext( this );
            Game.Controls.TouchPanel.Listen( ButtonState.Released, TouchRelease, null ).InContext( this );
            Game.Controls.TouchPanel.Listen( ButtonState.Down, TouchMove, null ).InContext( this );
        }

        public override void BindTo( Meter meter )
        {
            pressedDown = false;
            base.BindTo( meter );
        }

        public override void Unbind()
        {
            pressedDown = false;
            base.Unbind();
        }

        protected override void UpdateValue()
        {
            if ( Knob != null && Track != null && Meter != null )
                Knob.X = Track.Left + Track.Width * Meter.RelativeValue;
        }

        private void GenMove( Vector newPos )
        {
            Vector u = Vector.FromLengthAndAngle( 1, this.Angle );
            double newVal = newPos.ScalarProjection( u );

            if ( newVal < Track.Left ) Knob.X = Track.Left;
            else if ( newVal > Track.Right ) Knob.X = Track.Right;
            else Knob.X = newVal;

            Meter.RelativeValue = ( newVal - Track.Left ) / Track.Width;
        }

        private void MousePress()
        {
            if ( pressedDown ) return;
            UnsetChangedEvent();
            pressedDown = true;
        }

        private void MouseMove( AnalogState state )
        {
            Knob.Color = pressedDown || Game.Mouse.IsCursorOn( this ) ? _activeColor : _inactiveColor;

            if ( pressedDown )
                GenMove( Game.Mouse.PositionOnScreen - this.Position );
        }

        private void MouseRelease()
        {
            if ( !pressedDown ) return;
            pressedDown = false;
            SetChangedEvent();
        }

        private void TouchPress( Touch touch )
        {
            if ( touchObject != null ) return;
            UnsetChangedEvent();
            touchObject = touch;
            Knob.Color = _activeColor;
        }

        private void TouchMove( Touch touch )
        {
            if ( touchObject == touch )
                GenMove( touch.PositionOnScreen - this.Position );
        }

        private void TouchRelease( Touch touch )
        {
            if ( touchObject == null ) return;
            touchObject = null;
            SetChangedEvent();
            Knob.Color = _inactiveColor;
        }
    }
}